Work holding and feeding means for sewing-machines.



c. A. DEARBORN.

WORK HOLDING AND FEEDING MEANS FOR SEWING MACHINES.

APPLICATION FILED Mo. 22, 1910. 1,025,082.

Patented Apr. 30, 1912.

4 SHEETSSHEET 1.

c. A. DEARBORN.

WORK HOLDING AND FEEDING MEANS FOR SEWING MAGHINES.

APPLIOATION FILED DEC. 22, 1910. v 1,025,082. Patented Apr. 30; 1912.

4 SHEETS-SHEET 2.

I km /4/ G. A. DEARBORN.

WORK HOLDING AND FEEDING MEANS FOR SEWING MACHINES.

APPLICATION FILED DBO. 22, 1910. 1,()25,082 Patented Apr. 30, 1912.

4 BHBET8SHEET s.

C. A. DEARBORN. WORK HOLDING AND FEEDING MEANS FOR SEWING MACHINES.

- APPLICATION FILED DEC. 22, 1910. 1,025,082, I Patented Apr. 30, 1912.

4 SHEETS-SHEET 4.

WZW/ Zw as m a. MD. I

CHARLES A. DEARBORN, on NEW YoRK, N. Y., ASSIG1\TOR 1'0 DAVID J.unwnnnnor NEW YoRK, N. Y.

WORK HOLDING AND FEEDING MEANS FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Apr. 30, 1912.

Original application filed August 12, 1910, Serial No. 576,793. Dividedand this application filed December 22, 1910. Serial No. 598,752.

To all whom it may concern:

Be it known that I, CHARLES A. DEAR- BORN, a citizen of the UnitedStates, and a resident of the borough of Manhattan, city, county, andState of New York, have invented certain new and useful Improvements inWork Holding and Feeding Means for Sewing-Machines, of which thefollowing is a specification.

The present application is a division of my original application SerialNo. 57 6,7 93, filed August 12th, 1910, which has been confined toimprovements in stitch forming mechanism for sewing machines, and thepresent invention relates particularly to improvements in sewingmachines for overseaming blind stitch work of the power driven type suchas illustrated in Patent No. 814,025 granted to me March 6th, 1906.

The present invention includes improvements in the work supporting andfeeding mechanism of this type of machine, and the object of theinvention is to simplify andimprove the construction with a view of reducing the cost of manufacture, increasing the life of the machine,improving the quality of the work, and simplifying and increasing thespeed of the manipulation and operation of the machine.

The work supporting and feeding mechanism of the present inventionincludes modified forms of the work supporting plates or platens and thepresser foot of my above named patent. An oscillating ridge-forming ribor disk is mounted between the work supporting plates or latens andpreferably formed with forwar ly presented inclined cloth engaging teethand an upper reciprocating feeding device engages the work in the planeof feed adjacent to said rib or disk. The teeth of the ridge-formin diskare freed from the work on the bac (ward movement of the. disk becauseof the inclination of the teeth and. the raising of the upper feedingdevice from the work. The work supporting platens upon opposite sides ofthe ridge-forming disk are in the form of thin plates orfingerspivotally and yieldingly mounted upon spring sustained arms so that eachfinger or platen can yield independently either upon its supporting arm79 mg in or with its supporting arm. The ridgeforming rib or disk ismounted upon an oscillatory shaft having a novel driving connection witha suitable operating part of the machine such as the arm of the upper.feed device, so as toimpart'to said disk a back and forth oscillation.This form of ridge-forming rib' is of importance in fullor of the work.The presser foot is pivotally mounted upon the overhanging machine armabove the work support as in my above named patent, but unlike thestructure of said patent, the presser foot in my present machine isyieldingly held down in its normal position by a spring confined betweenthe presser foot and machine arm, said presser foot spring being of lessstrength than the spring of the work support, so that the presser footwill yield upwardly when an unusual thickness in the work passes underit. The upward yield ofthe presser foot is limited to prevent itsinterference with the movements of the looper and needle, and thepresser foot is out out at one side of the line of stitching to permitthe mounting of the/stationary stitch and needle guide close to the lineof stitching and at the same time allow the presser foot to yieldupwardly relatively to said guide.

In order that my invention may be fully understood I will first describethe same with reference to the accompanying draw-' ings, and afterwardpoint out thenovelty more particularly in the annexed claims.

, In said drawings: Figure 1 is a side elevation of my improved sewingmachine.

Fig. 2 is a plan view of the same. Fig. 3..

type to which my improvements are particu-' larly applicable is formedof a single casting working in. the under layer,

comprising a rigid central base 1, the upwardly extending arm 2terminating in sleeves or shaft bearings 3, and a forwardly extendingarm 5 having bearings for the needle rocker shaft 15 and for the looperand operating mechanism.

10 is the main driving shaft of the machine, journaled in the bearings 3of the rear arm 2 and having secured at one end the driving pulley 11and fly wheel 12.

15 is the forwardly-extending needle rockshaft j ournaled in thebearings 6 and 7 and having rigidly mounted upon its forward end aneedle-carrying rock-arm 16, in which is mounted a curved needle 17 18is the usual thread-guide and needleclamp mounted upon the rock-arm 16by means of the set-screw 19.

20 and 21 are ordinary thread-guides.

Secured to the rear end of the needle rockshaft 15 is a rock-arm 25,having universal joint connection 26 with a link 27, which encircles aneccentric 28, mounted upon the main power-shaft 10 just inside of thecrankdisk 13. The link 27 and the eccentric 28 are formed withspheroidal engaging surfaces to allow free lateral play of the link inthe transmission of the rotary motion of the main shaft 10 into theoscillatory motion of the needle shaft 15. By this needle-operatingmechanism (which is the same as in my prior patents) the needle is givena reciprocatory motion in an arc trans erse to the path of the workwhich is passed through the machine by the mechanisms now to bedescribed. I

Projecting up from the forward edge of the base 1 is an auxiliary arm30, which is rigidly secured to the base by means of setscrews or bolts31. The auxiliary arm 30 is formed at its upper end with two sleeves 32and 33, in which is mounted a pivot-shaft 34, projecting a little beyondeach of the sleeves 32 and 33. Set-screws 35 pass through the sleeves 32and 33 and engage the pivot-shaft 34 for holding it rigidly in position.

40 is a horizontal forwardly-extending spring-sustained work-supportingframe. This frame 40 has the rearwardly presented integral journalsleeves 41, which are journaled upon the projecting ends of thepivotshaft 34 and rest snugly against the frame sleeves 32 and 33', bywhich the work support 40 is accurately held in position, said supportbeing allowed to movd vertically upon its pivot. Surrounding the pivotshaft 34 between the sleeves 32 and 33 is a torsion spring 45, one end45 of which is extended beneath the work supporting plate 40 to holdsaid plate upward with a yielding pres sure, while the other end 45 ofsaid spring is extended down behind the auxiliary frame arm 30 and isengaged by the rear end 46 of the threaded rod 47, which passes freelythrough an opening formed in the arm 30 and is engaged at its forwardthreaded end by a butterfly nut 48, by which the tension of the spring45 can be increased or decreased at will. The work-support 40 is alsoformed with an integral downwardly projecting arm 41", extending belowthe lefthand bearing 41 in position to engage an adjustable stop in theform of a screw 49, which. is threaded through an integral post 50 ofthe auxiliary arm 30. By adjusting the screw-stop 49 the limit of thenormally raised position of the work-supporting plate 40 under theaction of the spring 45 can be adjusted to a nicet-y.

The work supporting plate 40 is extended to the left (viewing themachine from the front, as shown in Fig. 3) into a work supporting hornwhich is shaped to receive the ridge-forming disk and theindependently-yielding work-supporting plates, which will now beexplained.

is the ridge-forming and fulling in disk fixed upon a shaft 61 journaled in horizontal position in suitable bearings upon the horn Thisdisk 60 is formed with a series of forwardly presented inclinedclothengaging teeth 62 for the purpose hereinafter explained. Adjustablysecured to the shaft 61 is a rock arm 63 carrying at its upper end anadjustable crank pin 64.- This crank pin 64 is formed with a sphericalhead 65 mounted eccentrically with relation to the axis of the crankpin. This crank head can be adjusted upon its axis in the bearing formedin the arm 63 to adjust the length of the crank.

66 is a link pivotally connected with the spherical crank head 65 andextending therefrom rearwardly of the machineto a point 67 where it ispivotally connected with the upper feed arm 133 hereinafter referred to.By this means the shaft 61 is given a back and forth oscillatory motionfor oscillating the disk 60 in unison with the upper feed deviceshereinafter referred to.

Two independently yielding work supporting plates or platens are mountedadjacent to the ridge-forming rib 60, one being on each side of the rib.The work supporting plates or platens are both of the same 5construction so that a description of one will suffice for both. Eachplate or platen 70 is pivotally mounted at 71 on the upper end of acurved arm or lever 72 which is journaled upon a pin 73 mounted upon the120 horn 55 .of the work supporting frame 40. The arm orlever 7 2 curvesaround the shaft 61 for presenting the plate 70 in proper position. Acurved arm 72 extends from the bearing hub of the arm 72 and hasconnect- 125 ed with it a spring 74 attached at 75 to the horn of thework supporting frame for the purpose of yieldingly holding the arm orlever 72 in normal position. A spring 76 mounted upon a pin 77projecting from one 130 with a nut or collar 78 and its other end inengagement with the slotted heel of the plate or platen 70. This spring76 yield-;

pivot 71. Each plate 70 is formed with an 1 integral 111 70 'projectingfrom it in rear of the shaft 61 so as to engage said shaft and limit themovement of plate or platen 70 upon pin 71 inthe opposite direction. Itwill be observed that each plate or platen 70 is pivoted at a point nearits heel or rear end to the arm 72 and that the forwardly projectingportion of each plate or platen is cut out as shown at 70 to. givefreedom of motion either when the platen is moved upon its pivot ormoves with supporting arm 72. Fromthis construction it will be clearthat the rear end or heel of each platen will move'downwardly toward arm72 only in conjunction with the downward movement of arm 72 under theaction ofan extra thickness of material. 7

100 is the presser foot, removably secured by screws 101 to the forwardweb portion of a yoke '102, which is formed with rearwardly presentedlugs 103, which are pivoted upon set screws 104, mounted in thedownwardly projecting lug 105, formed integral with the machinearm 5'.

106 is a torsion spring secured to the machine arm and engagingthe'under surface of the yoke 102, as clearly illustrated and describedin my above named Patent No. 814,125. This spring 106 tends to move thepresser foot upwardly and to support it in normal approximatelyhorizontal position when the cloth supporting frame isde-. pressed.Mounted upon the upper face of the presser footlOO is a yoke 115 formedwith a central depression which rests in a transverse slot 117 formed ina headed guide pin or stud 116 secured to the machine arm 5 beneath theforward bearing for the needle rock shaft. This headed pin or stud 116confines between its head and'the sewing machine arm an expansion spring118, the lower end of which projectsacro'ss the slot 117 and engages theyoke 115. spring 106 above referred to holds the pivotally mountedpresser foot with its yoke 115' in engagement with the spring 118 andsince the sprlng 118 is stronger than the spring. 106, said spring 118will not be compressed to any appreciable extent when the presser footis in its normal position, but is capable of being compressed to allow aslight further upwardmovement of the presser foot when the presser footis subjected to a greater upward pressure. ward movement of the presserfoot may be the limit of the compression 'of spring 118 The The limit ofup- I or itmay' be limited by the depth of the slot 117. The spring 118is of less strength than the spring 45 above referred to so that when anunusual thickness of work passes between the presser foot and the worksupporting parts upon the supporting frame 40 the slightly to permit thepassage of the excess of thickness, and if the permitted upward movementof'the presser foot is not sufficient presser 'foot will move upwardpassage of the extra thickness in supporting plates 7 O and theridge-forming disk 60, and in which the upper feed member hereinafterreferred to operates. The

presser foot 100 is also formed at one side i of the slot 110 with aneedle guiding groove 111 and in rear of this groove is an'opening- 112into which the looper is depressed just prior to taking the loop fromthe needle. At its opposite side, the presser foot 100 is formed withan, opening 113 alongside of the main longitudinal slot 110.

Secured to the sewing machine arm 5 at 120 adjacent to the forwardbearing of the needle rock shaft is the stitch and needle guide 121,constructed as fully set forth and claimed in my above-named originalapplication, Serial No. 576,793. This guide member 121 is presented in aconstant relation tothe needle and looper without regard to the varyingthicknesses in the work and the changing positions of the presser foot,the slot or opening 113 of thepresser 'foot being of proper size'toreceive the lower end of the guide and thereby permit the movements ofthe presser foot. 7

Coiiperating with the work supporting devices described above, I'preferto employ an upperfeeding device of the constructhe needle." This twopart feed dog is preferably formed inte ral with andprojec'ts laterallyfrom a supporting arm 132, which is secured, by means of screws, to theforward end of a longitudinally movable rock-' .ing arm or bar 133.-This arm or bar 133 is formed between its ends with an elongated slot oropening 134:,inclined slightly from the horizontal. An anti-frictionroller 135 is supported upon one of the'set screws 104 from the machineframe lug 105 and engages in the inclined elongated slot or referred to.

machine by which the feed mechanism is opening 134 for supporting thearm or bar 133, with the feed dog in operative position. The rear end orbar 133 is formed with a yoke 136, which embraces an eccentric 137,fixed to the main driving shaft 10 of the operated. This eccentric willcause the arm or bar 133 to reciprocate forwardly and backwardly androck slightly upon its pivot roller 135 to raise and lower the feed dog.The inclined slot 134, moving over the antifriction roller 135 duringthe reciprocation of arm or bar 133, serves to counteract the lifting ofthe dog on its feeding stroke and increasing the lifting action on itsreturn stroke. The movement of the feed dog under the action of theeccentric, as modified by the inclined slot and roller support, will bea feeding stroke in a straight line in a horizontal plane and a returnstroke in an arc. The two rows of teeth upon the feed dog 130 and 131engage the work in slot 110 of the'presser foot directly above theindependently yielding work-supporting plates above referred to.

1 10 is a looper rod journaled in the bearings 141 and 1&2 projectingfrom the bearings of the needle rock shaft above These bearings supportthe looper rod 140 adjacent to the needle rock shaft and inclineddownwardly and inwardly with relation thereto. At the forward end of thelooper rod is the adjustably mounted looper properwhich is preferablyconstructed as fully described and claimed in my above-named originalapplication, Serial No. 576,793.

Between the bearings 141 and 142 the looper rodis provided with two tapewheels or pulleys 160, both of which are adjustably secured upon thelooper rod by means of set screws 161, and are formed with milledsurfaces 160 A driving tape or belt 165 operates upon each of the tapewheels or pulleys 160 to which it is secured at its end.

Each driving tape 165 extends from a wheel or pulley 160 to a pulleysegment 170, to which its opposite end is attached. These pulleysegments 170 are formed in tegral into a rocking member which isjournaled upon the pin 175 extending from the sewing machine arm 5, thetwo segments being arranged in parallel vertical planes extending atright angles to the planes in which the tape wheels or pulleys 160operate. These pulley segments are separated sufiiciently \to permit theconvenient arrangement of the tapes between the wheels or pulleys 160and said pulley segments, it being understood that the tapes extend inopposite directions around the tape wheels or pulleys so as to bealternately wound and unwound upon the wheels or pulleys under theaction of the rocking pulley segments.

The rocking connected pulley segments 170 have a crankpin 180 to whichis journaled the end of a link 181 journaled at its opposite end upon acrank pin 182 extending from the crank disk 13 fixed to the end of themain shaft 10 of the machine by which the pulley segments are oscillatedfor imparting the oscillating movements to the looper.

The described structure of the stitch forming mechanism forms no part ofthe present invention, but is fully claimed in my above-named originalapplication Serial No. 576,793.

The operation of the novel parts of the improved sewing machine will beunderstood from the following explanation.

The movements of the needle and the upper feed device are the same asexplained in my above-named patents and need not be further described,

The work to be sewed is inserted as in the former type of my machine bydepressing the work plate 10 and placing the work beneath the presserfoot 100 and above the ridge-forming disk 60 and work supporting platesor platens 70. The work supporting plate 40 is then allowed to move up1nto its normal position, which causes the disk 60 to press a ridge ofwork up into the main 1ongit-udinal slot 110 of the presser foot, theplates 70 supporting the work upon opposite sides of the ridge-formingdisk and yielding independently of each other to permit inequalities inthe work to pass beneath the presser foot under the action of thefeeding devices. Since the toothed ridge-forming disk 60 has a to andfro motion imparted to it simultaneously with the movements of the upperfeeding device, the under layer of the work will be worked in or fulledin It will'be understood that the adjustable crank upon shaft 61 enablesthe operator to determine the length of the oscillations of the tootheddisk 60 with relation to the stroke of the upper feeding device 130,131.

Ordinarily the adjustment will be such that the toothed disk 60 willhave oscillations a little greater in extent than the feeding stroke ofsaid upper feeding device, so that the under layer of work will befulled in This fulling in can be partially regulated at the will of theoperator by holding back upon the work more or less as it advances intothe machine.

In accommodating the varying thickness of the work passing between thepresser foot and work supporting devices, the. plates or platens 70 arecapable of yielding either upon their pivots 71 or upon the pivotalsupports of levers 72. In case an unusual thickness in the work passesover the disk 60 so that additional space must be afiorded between thedisk and the presser foot, the

spring 118 will yield to permit the presser foot to move upwardslightly, said upward movement of the presser foot not interfering inany way with the movements of the stitch forming mechanism.

I claim 1. In a sewing machine, the combination ofsuitable stitchforming mechanism, and suitable work feeding mechanism, with a springsustained Work support pivoted transversely of the line of feed,- apresser foot presented above said work support and having a restrictedyielding movement with relation thereto, and an oscillating toothedridge forming rib mounted upon said work support.

Y 2. In a sewingmachine, the combination of'a suitable frame,-having anoverhanging arm, a presser foot pivotally mounted upon said arm, aspring confined upon said arm, a yoke projecting from said presser footin engagement with the spring upon saidarm,

- and a spring sustained work support arranged beneath said presserfoot.

3. In a sewing machine, the combination of a suitable frame, having anoverhanging arm, a presser foot pivotally'mounted upon said arm, a guideprojecting from said arm, a spring confined upon said guide, a yokeprojecting from said presser foot in engagement with the spring uponsaid guide,'and a spring sustained work support arranged be-' neath saidpresser foot.

4. In a sewing machine, the combination of a suitable frame, having anoverhanging arm, a presser foot pivotally mounted upon 'said arm, aslotted guide pin projecting from said arm, a spring confined upon saidguide pin, a yoke projecting from said presser foot'into the slot ofsaid guide pin in engagement with the spring thereon, and

a springsustained work support arranged; beneath said presser foot.

5. In a sewing machine, the combination of a suitable frame, suitablestitch-forming mechanism including a reciprocating needle,

a stationary guide for said needle, a spring sustained work supportpivoted transversely of the line of stitching, a pivotally mountedpresser foot presented above said work support, and a spring yieldinglyholding said presser foot 111 operatlve'relationtosaid work support.

6. In a sewing machine, the combination. of suitable stitch formingmechanism, a slot-' ted presser foot, a yieldingly mounted work supportbeneath said presser foot, a ridge forming member upon said work supportadapted to press a rib of work up into the slot of saidpresser foot, anda pair of independently'yielding plates or platens mounted upon oppositesides of said ridge forming member to support the work upon oppositesides of the line of stitching, each of said plates or latens beingpivotally mounted upon a yie dingly supported rock arm.

7. In a sewing machine, the combination of suitable stitch formingmechanism, a

slotted presser foot, a yieldingly mounted slot-ted presser foot, ayieldingly mounted work support beneath said presser foot, a

ridge-forming device uponsaid work support adapted to press a rib ofwork up into the slot of said presser foot, and a pair of independentlyyielding plates or platens ,mounted upon opposite sides of saidridgeforming device to support the work upon opposite sides of the lineof stitching, each'of said plates or platens being pivotally mountedupon an axis extending at right angles to the line of stitching.

9. In a sewing machine, the combination of suitable stitch formingmechanism, a

slotted presser foot, a yieldingly mounted work support beneath saidpresser foot, a ridge forming device upon said work support adapted topress a rib of'work up into the slot of sa-idpresser foot, and a pair ofindependently yielding plates or platens mounted upon opposite sides ofsaid ridge forming device to support the work upon opposite sides of theline of stitching, each of said plates or platens being pivotallymounted upon a yieldingly supported rock arm and the axes of movement ofthe plates or platens and their supporting rock arms extending at rightangles to the line of stitching.

10. In a sewing machine, the combination ofsuitable stitch formingmechanism, a presser foot, a yieldingly mounted work support arrangedbeneath the presser foot, and independently yielding work supportingplates or "platens, each comprising a rock arm, a spring holdingsaidrock arm in normal position, a plate pivotally mounted upon saidrockarm, and a spring retaining said plate in normal position upon saidrock arm.

11. In a sewing machine, the combination of a suitable stitch. formingmechanism, a presser foot, a yieldingly mounted work support arrangedbeneath the presser foot, and independently yielding work supportingplates or platens, each comprising a rock arm extending parallel withthe line of stitching, a spring holding said r0ck arm in normalposition, a cloth engaging plate pivotally mounted upon said rock armand extending parallel with the line of stitching, and a springretaining said plate in normal position upon said rock arm.

12. In a sewing machine, the combination of a suitable stitch formingmechanism, a presser foot, a yieldingly mounted work support arrangedbeneath the presser foot, and independently yielding work supportingplates or platens, each comprising a rock arm, a spring holding saidrock arm in normal position, a plate pivotally mounted upon said rockarm, an arm projecting from said plate, a stop engaging said arm forlimiting the movement of the plate upon the rock arm in one direction,and a spring retaining said plate in normal position upon said rock arm.

13. In a sewing machine, the combination of. suitable stitch formingmechanism, a presser foot, a work support yieldingly mounted beneath thepresser foot, a shaft mounted upon said support, a ridge-forming diskcarried by said shaft, a journal pin mounted upon said support parallelwith said shaft, a pair of rock arms journaled upon said pin, springsretaining said rock arms in normal position, cloth supporting platespivotally mounted upon said rock arms above said shaft and arranged uponopposite sides of said ridge-forming disk, and springs mounted upon saidrock arms and engaging said plates for yieldingly supporting them uponthe rock arms.

14. In a sewing machine, the combination of suitable stitch formingmechanism, a presser foot, a work support yieldingly mounted beneath thepresser foot, a shaft mounted upon said support, a ridge-forming diskcarried by said shaft a journal pin mounted upon said support in frontof and parallel with said shaft, a pair of rock arms journaled upon saidpin and extending to the rear of said shaft, springs retaining said.rock arms in normal position, cloth supporting plates pivotally mountedupon said rock arms in rear of said shaft and extending forwardly abovesaid shaft and arranged upon opposite sides f0 said ridge-forming disk,and springs mounted upon said rock arms and engaging said plates foryieldingly supporting them upon the rock arms.

15. In a sewing machine, the combination of suitable stitch formingmechanism, a

presser foot, a work support yieldingly mounted beneath the presserfoot, a shaft mounted upon said support, a ridge-forming disk carried bysaid shaft, a journal pin mounted upon said support parallel with saidshaft, a pair of rock arms journaled upon said pin, springs retainingsaid rock arms in normal position, cloth supporting plates pivotallymounted upon said rock arms above said shaft and arranged upon oppositesides of said ridge-forming disk,

arms projecting from said plates into engagement with said shaft forlimiting the movements of said plates in one direct-ion, and springsmounted upon said rock arms and engaging said plates for yieldingly supporting them upon the rock arms.

16. In a sewing machine, the combination of suitable stitch formingmechanism, a slotted presser foot, a work support, a shaft journaled insaid work support, a ridgeforming disk secured upon said shaft in thesame plane with the slot of said presser foot, said disk being formedwith cloth engaging teeth, and operating means for imparting anoscillatory back and forth motion to said ridge-forming disk.

17 In a sewing machine, the combination of suitable stitch formingmechanism, a slotted presser foot, a work support, a shaft journaled insaid work support, a toothed ridge-forming disk secured upon said shaftin the same plane with the slot of said presser foot, operating meansfor imparting an oscillatory back and forth motion to said ridge-formingdisk, and a feeding device engaging the upper face of the work.

18. In a sewing machine, the combination of suitable stitch formingmechanism, a slotted presser foot, a work support, a shaft journaled insaid work support, a toothed ridge-forming disk secured upon said shaftin the same plane with the slot of said presser foot, and means foroperating said ridge-forming disk including a rock-arm upon said shaft,and an operating pitman having adjustable connection with said rockarm.

19. In a sewing-machine, the combination of suitable stitch formingmechanism, a slotted presser foot, a work support, a shaft journaled insaid work support, a toothed ridge-forming disk secured upon said shaftin the same plane with the slot of said presser foot, a rock arm uponsaid shaft, a

crank pin adjustably mounted in said rock arm and formed with aspherical head arranged eccentrically with relation to theaxis of saidpin, and an operating pitman plvotally engaging said head.

20. In a sewing machine, the combinatlon of suitable stitch formingmechanism, a slotted presser foot, a work support,a shaft journaled insaid work support, a toothed ridge-forming disk secured upon said shaftin the same plane with the .slot of said.

presser foot, a rock arm upon said shaft, a crank pin adjustably mountedin said rock arm and formed with a spherical head arranged eccentricallywith relation to the axis of said pin, a reciprocating feed arm, and anoperating pitman connected with said feed arm and pivotally engagingsaid head.

21. In a sewing machine, the combination of suitable stitch formingmechanism, a yieldingly mounted presser foot having a cloth receivingslot and a needle guide receiving slot, and a 'yieldingly mounted Worksupport arranged beneath said presser foot and carrying an oscillatorytoothed ridge forming disk which operates in said cloth receivin slot,with a stationary needle guide mounted above said presser foot and provslot.

CHAS. A. DEARBORN.

Vitnesses:

M. G. CRAWFORD, WM. E. KN/IGHT.

